| 摘要 |
A metal filter is provided which is capable of enhancing efficiency of seizing and removing black smoke minute particles by simplified and low-cost configuration. The metal filter is made up of a corrugated roll-shaped metal porous body (3, 6, 10, 14, 20, 30) fabricated by winding up, in a multi-layer manner and in a vortex form, a metal plate in which many through holes (2, 9, 12, 17, 19, 23, 29, 31) having surface-protrusions (1, 7, 11, 15, 18, 22, 28) at edge portions and which repeatedly forms a sine-wave shaped rising and falling structure. Exhaust gas from a diesel engine passes through clearances (4) among layers of the metal porous body (3, 6, 10, 14, 20, 30) and black smoke minute particles contained in the exhaust gas are seized and removed. The through holes (2, 9, 12, 17, 19, 23, 29, 31) are formed in crest portions (M) and trough portions (V) making up the rising and falling portions. Approximately all or a greater part of surface-protrusions (1, 7, 11, 15, 18, 22, 28) are formed on column-like concave portions (5) corresponding to lower parts of the crest portions (M) and to upper parts of the trough portions (V). <IMAGE> <IMAGE> |
